OP298AD Infrared Emitter - Equivalent & Substitute Parts

Part Overview

The OP298AD is an infrared (IR) emitter operating at 875nm wavelength, designed for through-hole radial mounting applications. Manufactured by TT Electronics/Optek Technology as part of the OP290 series, this component delivers 8.5mW/cm² radiant intensity at 100mA forward current with a 25° viewing angle. The OP298AD is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

OP298AD

TT Electronics/Optek TechnologyIn Stock: 1193OP298AD Datasheet

Current PartRFQ

OP298AA

TT Electronics/Optek TechnologyIn Stock: 754OP298AA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OP298AD is determined by the following critical parameters:

• Wavelength: Must be 875nm (infrared spectrum match)
• Current Rating: Must support 200mA DC forward current maximum
• Forward Voltage: Must be 2V typical
• Viewing Angle: Must be 25°
• Mounting Type: Must be through-hole radial configuration
• Operating Temperature: Must support -40°C to 100°C range
• Package / Case: Must be radial form factor

The OP298AA qualifies as a direct substitute based on matching all critical electrical and mechanical parameters. The primary difference is radiant intensity specification (4.6mW/cm² vs. 8.5mW/cm²), which represents a reduction in optical output but does not prevent functional substitution in applications where lower intensity is acceptable.

Parameter Comparison

Engineering Selection Recommendations

The OP298AA is the manufacturer-recommended substitute for the obsolete OP298AD. Both components maintain identical electrical specifications for wavelength, forward current, forward voltage, viewing angle, and operating temperature range. Both are ROHS3 compliant and REACH unaffected, ensuring regulatory alignment.

The OP298AA carries active product status, providing assured long-term availability and supply chain continuity. The reduction in radiant intensity from 8.5mW/cm² to 4.6mW/cm² must be evaluated against application requirements. In systems where optical output margin exists, the OP298AA provides direct functional replacement. In applications requiring the original 8.5mW/cm² specification, alternative components from the OP290 series or other manufacturers may require evaluation.

Frequently Asked Questions (FAQ)

Q: Can the OP298AA directly replace the OP298AD in existing designs?

A: The OP298AA matches all critical electrical and mechanical parameters of the OP298AD, including wavelength (875nm), forward current (200mA), forward voltage (2V), viewing angle (25°), and mounting configuration (through-hole radial). Substitution is valid provided the application tolerates the lower radiant intensity specification (4.6mW/cm² versus 8.5mW/cm²).

Q: What is the primary difference between these two parts?

A: The radiant intensity differs: OP298AD specifies 8.5mW/cm² @ 100mA, while OP298AA specifies 4.6mW/cm² @ 100mA. All other electrical and mechanical parameters are identical.

Q: Why is the OP298AD listed as obsolete?

A: The OP298AD has been discontinued by the manufacturer. The OP298AA, with active product status, represents the current production equivalent within the OP290 series.

Q: Are there packaging differences between these parts?

A: The OP298AD is specified with radial packaging, while the OP298AA is supplied in bulk packaging. Both use identical radial form factor for through-hole mounting.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the OP298AD and OP298AA are ROHS3 compliant, REACH unaffected, and carry MSL rating of 1 (Unlimited).